The invention is to provide a positive electrode material for sodium batteries, which has high operating potential and enable charging and discharging at high potential, and a method for producing thereof. The at least one limiting ring is embedded in the mounting portion of the housing and prevents the at least one turning rod from dropping out of the housing. In the method, the steel is made to consist of a structure composed of bainite andor martensite by containing prescribed amounts of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al and N, and, as occasion demands, one or more of B, V, Cu, Cr, Ca, REM, and Mg, and regulating C, Si, Mn, Cr, Ni, Cu, V and Mo. The ratchet drive surfaces are provided with pawl engaging surfaces which may be driven in either of two directions.